Pokémon X and Pokémon Y

It adds another layer to serious battling: do you go for higher stats, different typing and ability or do you get to use an item (and a different Mega Pokemon, since you can only use one on your team at a time)? Some Pokemon lose more than just an item when Mega Evolving.

That's a really good point, but being still as relative as using any kind of item but with the inherent meaning of an "upgraded mode", I still think it was created more as fan service than actual competitive variety. I understand my view is pretty biased and that matter shouldn't bother me... but it does.

A permanent evolution which raises stats even higher would make them more powerful all around without losing anything. For Pokemon like Garchomp, that is overkill.

My bad on not clarifying... I was not thinking on fully evolved and powerful Pokémon when mentioning traditional evolution and balance at all, but on the unpopular and low stats Pokémon.

Legendaries are overrated. All Pokemon can be great. I'm glad they at least tried to dig deeper with MegaKangaskhan (and we still don't have the full Mega Evolution list). Although I agree that mostly mainstream Pokemon have been getting it.

You're right. It's just that since legendaries are supossed to be overrated and so wanted, I feel the alternate form suits them better. I'm also glad they've tweaked the less fortunate, but I'm of the idea that they should've given all Pokémon the same treatment since they're claiming introducing the system for balance.